It was a while ago since I heard it (paired with dx100) and I would say it is slightly warmer and mid centric. But this is going off memory so don't rely on this. Btw the balanced amp uses 2 opa627 per channel vs 1 per for 627x...

The balanced card uses 2 opa627 per channel for balanced but for SE operation it uses 1 chip per channel.

Quote:

Originally Posted by jelt2359

So why does the 627x have 3x627 and 3x634 chips inside? I'm confused..

The balanced card uses 1 opa627 for each channel in SE operation. The portaphile uses also 1 opa627 per channel and also an additional 1opa627 for the ground channel. IMO this is the better way to do it for SE.

Um.... My HM-901 charger exploded yesterday... It was my first time trying to charge my HM-901, and when I plugged the charger in, sparks and little flames came out. The plug even has some burnt-mark on it. Now I can't charge my HM-901, and a new charger would cost me about 400 RMB more to purchase. Any of you guys know if this is covered with warranty?

Um.... My HM-901 charger exploded yesterday... It was my first time trying to charge my HM-901, and when I plugged the charger in, sparks and little flames came out. The plug even has some burnt-mark on it. Now I can't charge my HM-901, and a new charger would cost me about 400 RMB more to purchase. Any of you guys know if this is covered with warranty?

B.T.W., not being able to charge via usb is a pain in the neck...

It would seem that it would have to be covered. Have you emailed Hifiman?

AC Gears shipped my HM-901 via unreliable USPS. It was out for delivery on Friday so I took the day off work to sign for the package, which never arrived. The postman came and went today, Saturday, with no package. I visited the post office and was told it was placed in my (small) mailbox on Friday and they said AC Gears waived a delivery signature. I received my mail, but no package. 17 years at this residence with multiple UPS and FedEx packages delivered weekly, and never a problem. USPS shipping, no signature required, $50 insurance, what a joke. Contacting my CC to dispute charge and will reorder the HF-901 from somewhere else.

Well, when USPS says your Priority 2-Day package is "out for delivery" they mean it's touring your neighborhood on a 4 day journey in the back of a mail truck. And when the mailman says he delivered the package on Friday, he might be mistaken by a few days. And AC Gear's free shipping wasn't entirely free, as $12 shipping was due at delivery. But hey, I have my HM-901, so I'm happy.

I installed the balanced card, popped in my 256GB SDXC memory card completely filled (the HM-901 must have its own internal memory for the database TOC) and gave it a few hours charge. My unit came with firmware v.1.08. I've shuffled through a few albums and no problems with the 256GB card. Listened to several 24/192 tracks from Hdtracks, and DSDs converted w. Saracon to 24/192 and I'm very pleased with the sound.

While the HM-901 isn't very big, its much heavier than it looks. I was hoping to occasionally take it to the gym, giving my AK120 a rest, but it would likely pull my shorts off if strapped to my side without a belt. For traveling, it would be nice to have a more compact charger, but I'm not sure if HiFiMAN will offer further charging options.

Um.... My HM-901 charger exploded yesterday... It was my first time trying to charge my HM-901, and when I plugged the charger in, sparks and little flames came out. The plug even has some burnt-mark on it. Now I can't charge my HM-901, and a new charger would cost me about 400 RMB more to purchase. Any of you guys know if this is covered with warranty?

B.T.W., not being able to charge via usb is a pain in the neck...

Wow thats sound scary! I also agree they must cover this. I have heard third party camera or cellphone battery exploded before but charger? Really news to me..... even with "little flame came out" causing burnt mark...!!

Well, when USPS says your Priority 2-Day package is "out for delivery" they mean it's touring your neighborhood on a 4 day journey in the back of a mail truck. And when the mailman says he delivered the package on Friday, he might be mistaken by a few days. And AC Gear's free shipping wasn't entirely free, as $12 shipping was due at delivery. But hey, I have my HM-901, so I'm happy.

I installed the balanced card, popped in my 256GB SDXC memory card completely filled (the HM-901 must have its own internal memory for the database TOC) and gave it a few hours charge. My unit came with firmware v.1.08. I've shuffled through a few albums and no problems with the 256GB card. Listened to several 24/192 tracks from Hdtracks, and DSDs converted w. Saracon to 24/192 and I'm very pleased with the sound.

While the HM-901 isn't very big, its much heavier than it looks. I was hoping to occasionally take it to the gym, giving my AK120 a rest, but it would likely pull my shorts off if strapped to my side without a belt. For traveling, it would be nice to have a more compact charger, but I'm not sure if HiFiMAN will offer further charging options.

Congratz! I also had this dilemma of bringing the 901 or ak120 when I'm on the go. I find myself reaching for the 901 most of the times unless it is not charged, or if I wasn't sure if I would have time to listen on the go.

Well, when USPS says your Priority 2-Day package is "out for delivery" they mean it's touring your neighborhood on a 4 day journey in the back of a mail truck. And when the mailman says he delivered the package on Friday, he might be mistaken by a few days. And AC Gear's free shipping wasn't entirely free, as $12 shipping was due at delivery. But hey, I have my HM-901, so I'm happy.

I installed the balanced card, popped in my 256GB SDXC memory card completely filled (the HM-901 must have its own internal memory for the database TOC) and gave it a few hours charge. My unit came with firmware v.1.08. I've shuffled through a few albums and no problems with the 256GB card. Listened to several 24/192 tracks from Hdtracks, and DSDs converted w. Saracon to 24/192 and I'm very pleased with the sound.

While the HM-901 isn't very big, its much heavier than it looks. I was hoping to occasionally take it to the gym, giving my AK120 a rest, but it would likely pull my shorts off if strapped to my side without a belt. For traveling, it would be nice to have a more compact charger, but I'm not sure if HiFiMAN will offer further charging options.

Oh far out a 256GB card works aye? I didn't even know you could get those... Will be cool when the first terabyte SD comes out!

The balanced amp sounds great, but how do I do line out to my other portable amps to give my other options a try? Is that dock hole a common thing in this industry? What's it called if so? Sorry for the newbie qns..

Well, first of all we all agree there is no duck here ... haha ... but there is a multi connection interface/plug in the bottom of the DAP designed by HiFiMan, and most likely inspired by Apple, which is used for all kinds of in-out signals (except for headphones of course). This includes digital in/out and line out.